2 * Hardware monitoring driver for IR35221
4 * Copyright (C) IBM Corporation 2017.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/err.h>
13 #include <linux/i2c.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
19 #define IR35221_MFR_VIN_PEAK 0xc5
20 #define IR35221_MFR_VOUT_PEAK 0xc6
21 #define IR35221_MFR_IOUT_PEAK 0xc7
22 #define IR35221_MFR_TEMP_PEAK 0xc8
23 #define IR35221_MFR_VIN_VALLEY 0xc9
24 #define IR35221_MFR_VOUT_VALLEY 0xca
25 #define IR35221_MFR_IOUT_VALLEY 0xcb
26 #define IR35221_MFR_TEMP_VALLEY 0xcc
28 static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
33 case PMBUS_VIRT_READ_VIN_MAX:
34 ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
36 case PMBUS_VIRT_READ_VOUT_MAX:
37 ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
39 case PMBUS_VIRT_READ_IOUT_MAX:
40 ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
42 case PMBUS_VIRT_READ_TEMP_MAX:
43 ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
45 case PMBUS_VIRT_READ_VIN_MIN:
46 ret = pmbus_read_word_data(client, page,
47 IR35221_MFR_VIN_VALLEY);
49 case PMBUS_VIRT_READ_VOUT_MIN:
50 ret = pmbus_read_word_data(client, page,
51 IR35221_MFR_VOUT_VALLEY);
53 case PMBUS_VIRT_READ_IOUT_MIN:
54 ret = pmbus_read_word_data(client, page,
55 IR35221_MFR_IOUT_VALLEY);
57 case PMBUS_VIRT_READ_TEMP_MIN:
58 ret = pmbus_read_word_data(client, page,
59 IR35221_MFR_TEMP_VALLEY);
69 static int ir35221_probe(struct i2c_client *client,
70 const struct i2c_device_id *id)
72 struct pmbus_driver_info *info;
73 u8 buf[I2C_SMBUS_BLOCK_MAX];
76 if (!i2c_check_functionality(client->adapter,
77 I2C_FUNC_SMBUS_READ_BYTE_DATA
78 | I2C_FUNC_SMBUS_READ_WORD_DATA
79 | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
82 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
84 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
87 if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
88 dev_err(&client->dev, "MFR_ID unrecognised\n");
92 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
94 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
97 if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
98 dev_err(&client->dev, "MFR_MODEL unrecognised\n");
102 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
107 info->read_word_data = ir35221_read_word_data;
110 info->format[PSC_VOLTAGE_IN] = linear;
111 info->format[PSC_VOLTAGE_OUT] = linear;
112 info->format[PSC_CURRENT_IN] = linear;
113 info->format[PSC_CURRENT_OUT] = linear;
114 info->format[PSC_POWER] = linear;
115 info->format[PSC_TEMPERATURE] = linear;
117 info->func[0] = PMBUS_HAVE_VIN
118 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
119 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
120 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
121 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
122 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
123 info->func[1] = info->func[0];
125 return pmbus_do_probe(client, id, info);
128 static const struct i2c_device_id ir35221_id[] = {
133 MODULE_DEVICE_TABLE(i2c, ir35221_id);
135 static struct i2c_driver ir35221_driver = {
139 .probe = ir35221_probe,
140 .remove = pmbus_do_remove,
141 .id_table = ir35221_id,
144 module_i2c_driver(ir35221_driver);
146 MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
147 MODULE_DESCRIPTION("PMBus driver for IR35221");
148 MODULE_LICENSE("GPL");